Priming device for explosive-engines.



S. J. TODD.

PRIMING DEVICE FOR EXPLOSIVE ENGINES.

APPLICATION FILED NOV. 30, I9I4.

1,168,920, I Patented Jan. 18, 1916.

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UNITED STATES PATENT OFFICE.

SAMUEL J. TODD, 0F HIGHLAND PARK, MICHIGAN, ASSIGNOR OF THREEFFOURTHS TOBEN C. HUGHES, 013 DETROIT, MICHIGAN.

Specification of Letters Patent.

Patented Jan. 18, 1916.

Application filed November 30, 1914. Serial No. 874,649.

To all whom it may concern: 7

Be it known that I, SAMUEL J. Tom), a citizen of the United States ofAmerica, residing at Highland Park, in the county of \Vayne and State ofMichigan, have invented certain new and useful Improvements in PrimingDevices for Explosive-Engines,

combine a spark plug and primingdevice and furnish the same with a fuelor gasolene supply that can be easily controlled by the operator of anautomobile to insure positive and certain sparking at the proper time.

Another object of this invention is to furnish the cylinder of an enginewith combined spark plugs and priming devices that can be actuated insynchronism to admit predetermined quantities of fuel or gasolene to thecylinders of the engine, thereby insuring an explosion in one of thecylinders of the engine for starting purposes.

A further object of my invention is to provide a simple, durable andinexpensive priming device, wherein the heat of a sparking plug isutilized for raising the temperature of gasolene or other fuel prior tothe same being admitted to an engine cylinder for priming purposes.

\Vith the above and other objects in View, the invention resides in thenovel construction, combination and arrangement of parts to behereinafter specifically described and then claimed.

Reference will now be had to the drawing, wherein Figure 1 is adiagrammatic view illustrating the fuel supply and operating mechanismfor a priming device in accordance with my invention; Fig. 2 is averticalsectional view of a combined spark plug and priming device thathas been especially d signed for Ford automobiles; and Fig. Q is ahorizontal sectional view of a portion of the same taken on the line w-wof Fig. 2.

In describing ni invention by aid ofthe vipws above referred to, Idesire to point out that I intend the Same as merely illustratlve p ofan example whereby my invention may be applied in practice, and I do notcare to limit my invention to the precise construction and arrangementof parts shown. The following description is therefore to be broadlyconstrued as including substitute constructions and arrangement of partsthat are the obvious equivalents of those to be hereinafter referred to.

Referring first to Figs. 2 and 3 of the drawing, 1 denotes a spark plugbody made of metal with the lower end thereof reduced and exteriorlyscrewthreaded, whereby the spark. plug body can be mounted in orconnected to the wall 3 of an engine cylinder.

The spark plug body 1 has a stepped bore 4 throughout its lengthproviding an annular shoulder 5 intermediate the edges thereof and atapering seat 6 in proximity to the upper end of the spark plug body.The annular shoulder 5 affords a seat for a cushioning ring 7 supportingthe collar 8 of a porcelain insulator body 9. The cushioning ring 7 isreferably made of copper and asbestos in the usual and well known mannerand avoids fracture of the porcelain body 9 due either to sudden changesin the temperature, unequal expansion and contraction. and mechanicalstress on the porcelain body caused by the clamping or securing meansthereof. The lower end of the porcelain body 9 terminates in the lowerend of the bodv 4 and is provided with a central electrode 10cooperating with an electrode 11 of the spark plug body in forming agap. The spark is formed in the well known manner by the jumping of thecurrent from .one electrode to the other. thereby firing the charge inan engine cylinder.

The upper end of the porcelain body 9 protrudes some distance above thespark plug body to avoid short circuiting. The central electrode 10,which is baked or otherwise mounted centrally of the porcelain body 9,protrudes from the upper end thereofand is provided with a binding post12 to which a wire or electric conduit can be connected.

Thehollow collar 16 serves as anauxiliary 110 servo]: inbe between saidvalve body .52 said fue supply and adapted to be waxed by said sparklug, and means in valve body for elivering predate! and quantities ofheated fuel to said spark mg. In a combined spark plug and priming nnee, a spark plug body, a valve body carded thereby, a porcelain body insaid spark gilt: body, an auxiliary fuel reservoir in mi spark plug bodyaround said porcelain l?=' dy, and a valve plugin said valve body 1-.apted to establish communication between i3 auxiliary fuel reservoirandsaid spark mg body. 7

in a combined spark plug and priming device, a spark plug body, a valvebody carried hereby, a porcelain body in said spark plu body, anauxiliary fuel reservoir in said spark plug body around said porcelainbody, a valve plug in said valve'body adapted to esiabl'ishcommunication between said auxiliary fuel reservoir and said spark plugbody and means supported by said spark plug for imparting movement tosaid valve plug v i In testimony .Whereofl aflix my signature inpresence of two Witnesses.v

. SAMUEL J. TODD.

Witnesses:

ANNA M. Dona, KARL H. BUTLER.

